Rock-drill-sharpening machine.



c. J'. SMITH.. ROCK DRILL SHABPENING MACHINE;

APPLICATION FILED MAY 29, 1907.

Patented Apr. 27, 1909.

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CLARK J. SMITH, OF OTTUMWA, IOWA, ASSIGNOR TO I-IARDSOCG WONDER DRILL COMPANY,

IN CORPORATED, OF OTIUIVIWA, IOWA.

ROCK-DRILL-SHARPEN ING MACHINE.

Original application led February 8, 1907, Serial N o. 356,481.

Specification of Letters Patent.

Patented April 27, 1909. Divided and this application filed May 29, 1907.

Serial No. 376,345.

To all 'whom it may concern:

ing at Ottumwa, in the county of YvVapello and State of Iowa, have invented certain new and useful Improvements in Iock-Drill- Sharpening Machines, of which the following is a specification.

My invention relates to certain new and useful improvements in rock drill sharpening means of the type disclosed in my co-pending application liled Feb. S, 1907, Ser. No. 356481, of which this application forms a divisional part.

Generically, my present invention comprises a suitable supporting bed upon which the sharpening mechanism is mounted and the sharpening mechanism consists of a drill supporting' means including a pneumatic bumper or holder to cooperate with the drill and also it includes a dolly holder and hammering engine to cooperate with the dolly for sharpening the drill end and upsetting it into form. The pneumatic hammer includes means cooperatively connected therewith whereby the same can be controlled and automatically fed up to the work.

In its more subordinate nature, the invention embodies certain novel details of construction, combination and arrangement of parts, all of which will be lirst described in detail and then be specilically pointed out in the appended claims, reference being had to the accompanying drawings, in which Figure 1, is a central, vertical, longitudinal section of my invention, showing the position of the parts just prior to bringing the dolly in engagement with the bit. Fig. 2, is a similar view showing the position of the parts as the dolly is engaging the bit to sharpen same and the piston of the hammer being in its dolly engaging position. Fig. 3, is an enlarged view oi' a portion of my invention. Fig. 4, is a detail perspective View of the end of a drill bit formed by my machine. Figs. 5, 6 and 7 are perspective views of the various forms of dollies which may be used in my machine. Fig. 8 is an enlarged detail sectional view of the valve 11 and its cooperating parts.

Referring now to the accompanying drawings in which like numerals and letters of re erence indicate like parts in all of the iigures, 1 designates the bed frame of the machine, which comprises the bed l l which may i' be in the nature oi an ordinary I-beam, to Be 1t known that I, CLARK J. SMITH, residwhich are bolted the standards or legs 1h. To one end of the I-beam la is a drill holder 2 that is secured by bolts 2 or otherwise, and the drill holder 2 is bored out as at 2h to form a hollow chamber which is closed at one l end by the web 2C that has an aperture as at' 2d to receive the end 3 of the drill bit 3. The chamber 2b is closed at the other end by a threaded plug 2e which has a passage 2r communicating with the air feed pipe 2g.

Held within the chamber 2 is a builer block 2h which is held against the end 3a of the drill bit 3 by pneumatic pressure within the chamber 2b between-the buffer block 2h and the plug 2, in a manner more fully eX- plained later.

Slidably mounted on the I-beam l.il is a drill carriage 4 which has llanges 4a to fit over the I-beam and which is provided with a drill receiving pocket 4b whereby the drill may be held in thc pocket 4b in such a manner as to readily be removable.

5 designates the hammer support which is 'fixed to the I-beam la by set screws 5a if desired, and the hammer support is provided with a longitudinal aperture 5b to receive thc hammer casing 6. 'lhe hammer casing and hammer will be more fully described later.

7 designates the dolly support which is slidably mounted on the I-beam 1LL in a m anner similar to the drill support 4, and the dolly support 7 has flanges 7u to cooperate with the I-beam 1a and has a dolly receiving aperture 7b in which the dolly 8 is held.

The dolly S has a shank 8" and a head 8b which is provided with cutting points or teeth 8c as clearly shown in Fig. l. A ccnter 8d is provided lor use whenever a hollow drill bit is being operated upon. The shank 8 oil the dolly 8 is of two diameters, one ol'I which SX, is such as to lit into the chuck 0X of the hammer casing.

The pneumatic hammer in my present invention is of the reciprocating type and consists of thc casing 6 which has a central bore provided with internal annular llanges GfL` 6b-6c to separate the bore into a series of chambers 61--6e`6L-6g respectively, the chamber 6g being adjacent the chuck end of the casing and communicating with the atmosphere through exhaust ports 6h, as shown. The end of the casing 6 opposite the chuck 6X is closed by a sorewplug oy having a bore GZ that merges with a passage 6k 1n the hammer casing; the passage 6k com- Ymunicates with the chamber Gf through a port 6m, as shown. The passage between the chambers Gf and 6g formed by the Web 6C is of less diameter than that between the chambers d-e-f, to properly ccperate with the reciprocating hammer piston .6 Which has a central bore 6P and radial apertures 6 and 6s at opposite ends. The screvv plug 61 receives the piston rod QY that passes through the cap 9 on the feed piston casing 9 and the piston rod 9V projects into the casing 9 and carries a suitably packed piston head QZ. The feed piston casing 9 is held in the support 10 by a set screw 10a, the support 10 being in turn xedly secured to the lifbeam by screw bolts 101? or in any other suitable Way. The other end of the piston casing 9 is closed by the screw plug 9h having a passage through Which the Working agent is passed from the Working agent feed supply pipe 9C. The Working agent passes through a three-Way valve 11 before it comes in contact With the piston 9. rThe three Way valve 1.1 has ports that permit passage of the Working agent from the supply pipe 9C into the piston casing 9 to force the piston 92 .outf Ward. The ports of the valve 11 are also so arranged that When the valve is in another position the Working agent VWithin the chamber 9 of the piston 9 Will be exhausted to atmosphere through the port 9S, but when the valve 11 is in the third. position the eX- haust port 9F as Well as the Working agent feed to the chamber Qf is cut off, rendering the feeding of the pneumatic hammer to the Work inoperative.

The three Way valve 11 is operated through the rod 12 (see dotted lines, Fig. 2) that passes through the bearing 12et on the end of a bracket 12b secured to the bed plate 1a of the machine, the end of the rod 12 being adjacent the drill support 4 so that the operator may grasp the drill 3 and at the same time. manipulate the threefivay valve 11.

ln Figs. 5, 6, and 7 l have shown several forms of dollies, one end of which may be used to form the end of the drill, since in the practical application of my invention, l def sire it understood that While the sir-.point bit is usually used, l do not limit myself to the sharpening .of bits having siX points since my machine can be used With sharpen-l ing dies having the ordinary chisel point or any number of points, the dolly which does the sharpening may have the same number of points as the bit shown in Fig. el (see Fig. 5) or it may have a less number of points as Will be readily understood by those skilled in the art to which my invention appertains. The dolly heads in Figs. 5, 6 and 7 are indi.-

cated by the reference numerals 8b, 18b and 28b respectively.

So far as described, the manner in Which my invention operates Will be best explained as follows z-After the drill 3 has had its end 3 inserted into the holder 2 With its end 3b ready to be operated upon by the dolly 8, lthe operator opens the three-Way valve 9 to admit the Working agent into the chamber 91 of the feed piston mechanism Which forces the hammer casing 6, and consequently the dolly 8 forward until the dolly 8 is in contact With the end 3b of the bit 8. As the feeding takes place the Working agent will pass through the aperture in the piston rod 9V and through the passage 6k into the interior of the casing 6 and thus operating the hammer 6 to force the dolly S to form the teeth on the end of the bit 3, and at the same time upsetting the same asy at 3C to bring it into proper shape, it being understoodthat the operator may turn the drill on its longitudif nal axis duringthese operations, vif desired. After the drill has been sharpened and upset by the action of the dolly S it is removed from the holders 2 and 4 and placed in a suitable shaping machiney such for instance, as disclosed in my co-pending application.

Frein the foregoing, taken in connection With the accompanying drawings, the com.- plete constructio'n, operation and advantages of my invention will be readily understood by those skilled in the art to which it apper tains.

1. In an apparatus of the class described, a bit holding means and a dolly holding means, .a means for feeding the dolly to the bit and impacting the dolly against the bit to cut the teeth thereon, .combined with a holder for the bit end having a'chamber, a piston .operatable lin said chamber against which the bit'contacts and 'means for estab.- lishing a iiuid pressure Withinv said chamber to hold said piston against the bit to form an impact relieving means substantially as shown and described..

2. ln an apparatus ef the class described, a drill bit holding means, combined With pneumatic means for relieving the impact on the drill bit, said last named means cornprising a receiver for one end of the drill bit, said receiver having. a chamber, a piston Within said chamber for engagingthe drill bit end, and means for leadingicompressed agent into the chamber to force the piston into contact With the bit end, substantiallyas shown and described.

CLARK J SMITH.

Vitnesses G. S. OBR, F.V H. HosivELL. 

